//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2020 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
import com.pdftron.pdf.*;
import com.pdftron.sdf.SDFDoc;
public class OptimizerTest {
//---------------------------------------------------------------------------------------
// The following sample illustrates how to reduce PDF file size using 'pdftron.PDF.Optimizer'.
// The sample also shows how to simplify and optimize PDF documents for viewing on mobile devices
// and on the Web using 'pdftron.PDF.Flattener'.
//
// @note Both 'Optimizer' and 'Flattener' are separately licensable add-on options to the core PDFNet license.
//
// ----
//
// 'pdftron.PDF.Optimizer' can be used to optimize PDF documents by reducing the file size, removing
// redundant information, and compressing data streams using the latest in image compression technology.
//
// PDF Optimizer can compress and shrink PDF file size with the following operations:
// - Remove duplicated fonts, images, ICC profiles, and any other data stream.
// - Optionally convert high-quality or print-ready PDF files to small, efficient and web-ready PDF.
// - Optionally down-sample large images to a given resolution.
// - Optionally compress or recompress PDF images using JBIG2 and JPEG2000 compression formats.
// - Compress uncompressed streams and remove unused PDF objects.
//
// 'pdftron.PDF.Flattener' can be used to speed-up PDF rendering on mobile devices and on the Web by
// simplifying page content (e.g. flattening complex graphics into images) while maintaining vector text
// whenever possible.
//
// Flattener can also be used to simplify process of writing custom converters from PDF to other formats.
// In this case, Flattener can be used as first step in the conversion pipeline to reduce any PDF to a
// very simple representation (e.g. vector text on top of a background image).
//---------------------------------------------------------------------------------------
public static void main(String[] args) {
String input_path = "../../TestFiles/";
String output_path = "../../TestFiles/Output/";
String input_filename = "newsletter.pdf";
String input_filename2 = "newsletter_opt1.pdf";
String input_filename3 = "newsletter_opt2.pdf";
String input_filename4 = "newsletter_opt3.pdf";
String input_filename5 = "newsletter_SaveViewerOptimized.pdf";
PDFNet.initialize();
//--------------------------------------------------------------------------------
// Example 1) Optimize a PDF.
try {
PDFDoc doc = new PDFDoc(input_path + input_filename);
doc.initSecurityHandler();
Optimizer.optimize(doc);
doc.save(output_path + input_filename2, SDFDoc.SaveMode.LINEARIZED, null);
// output PDF doc
doc.close();
} catch (Exception e) {
e.printStackTrace();
return;
}
//--------------------------------------------------------------------------------
// Example 2) Reduce image quality and use jpeg compression for
// non monochrome images.
try {
PDFDoc doc = new PDFDoc(input_path + input_filename);
doc.initSecurityHandler();
Optimizer.ImageSettings image_settings = new Optimizer.ImageSettings();
;
// low quality jpeg compression
image_settings.setCompressionMode(Optimizer.ImageSettings.e_jpeg);
image_settings.setQuality(1);
// Set the output dpi to be standard screen resolution
image_settings.setImageDPI(144, 96);
// this option will recompress images not compressed with
// jpeg compression and use the result if the new image
// is smaller.
image_settings.forceRecompression(true);
// this option is not commonly used since it can
// potentially lead to larger files. It should be enabled
// only if the output compression specified should be applied
// to every image of a given type regardless of the output image size
//image_settings.forceChanges(true);
Optimizer.OptimizerSettings opt_settings = new Optimizer.OptimizerSettings();
opt_settings.setColorImageSettings(image_settings);
opt_settings.setGrayscaleImageSettings(image_settings);
Optimizer.optimize(doc, opt_settings);
doc.save(output_path + input_filename3, SDFDoc.SaveMode.LINEARIZED, null);
// output PDF doc
doc.close();
} catch (Exception e) {
e.printStackTrace();
return;
}
//--------------------------------------------------------------------------------
// Example 3) Use monochrome image settings and default settings
// for color and grayscale images.
try {
PDFDoc doc = new PDFDoc(input_path + input_filename);
doc.initSecurityHandler();
Optimizer.MonoImageSettings mono_image_settings = new Optimizer.MonoImageSettings();
mono_image_settings.setCompressionMode(Optimizer.MonoImageSettings.e_jbig2);
mono_image_settings.forceRecompression(true);
Optimizer.OptimizerSettings opt_settings = new Optimizer.OptimizerSettings();
opt_settings.setMonoImageSettings(mono_image_settings);
Optimizer.optimize(doc, opt_settings);
doc.save(output_path + input_filename4, SDFDoc.SaveMode.LINEARIZED, null);
// output PDF doc
doc.close();
} catch (Exception e) {
e.printStackTrace();
return;
}
// ----------------------------------------------------------------------
// Example 4) Use Flattener to simplify content in this document
// using default settings
try {
PDFDoc doc = new PDFDoc(input_path + "TigerText.pdf");
doc.initSecurityHandler();
Flattener fl = new Flattener();
// The following lines can increase the resolution of background
// images.
//fl.setDPI(300);
//fl.setMaximumImagePixels(5000000);
// This line can be used to output Flate compressed background
// images rather than DCTDecode compressed images which is the default
//fl.setPreferJPG(false);
// In order to adjust thresholds for when text is Flattened
// the following function can be used.
//fl.setThreshold(Flattener.e_keep_most);
// We use e_fast option here since it is usually preferable
// to avoid Flattening simple pages in terms of size and
// rendering speed. If the desire is to simplify the
// document for processing such that it contains only text and
// a background image e_simple should be used instead.
fl.Process(doc, Flattener.e_fast);
doc.save(output_path + "TigerText_flatten.pdf", SDFDoc.SaveMode.LINEARIZED, null);
// output PDF doc
doc.close();
} catch (Exception e) {
e.printStackTrace();
return;
}
// ----------------------------------------------------------------------
// Example 5) Optimize a PDF for viewing using SaveViewerOptimized.
try {
PDFDoc doc = new PDFDoc(input_path + input_filename);
doc.initSecurityHandler();
ViewerOptimizedOptions opts = new ViewerOptimizedOptions();
// set the maximum dimension (width or height) that thumbnails will have.
opts.setThumbnailSize(1500);
// set thumbnail rendering threshold. A number from 0 (include all thumbnails) to 100 (include only the first thumbnail)
// representing the complexity at which SaveViewerOptimized would include the thumbnail.
// By default it only produces thumbnails on the first and complex pages.
// The following line will produce thumbnails on every page.
// opts.setThumbnailRenderingThreshold(0);
doc.saveViewerOptimized(output_path + input_filename5 , opts);
// output PDF doc
doc.close();
} catch (Exception e) {
e.printStackTrace();
return;
}
PDFNet.terminate();
}
}
